package com.atguigu.modules.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.modules.gulimall.product.dao.CategoryDao;
import com.atguigu.modules.gulimall.product.entity.CategoryEntity;
import com.atguigu.modules.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
//    @Autowired
//    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        // 查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        // 组装父子结构
        //1 找到所有1级分类
        List<CategoryEntity> level1Menue = entities.stream().
                filter(categoryEntity -> categoryEntity.getParentCid() == 0).
                map((menu)->{
                    menu.setChildren(getChildrens(menu,entities));
                    return menu;
                }).
                sorted(Comparator.comparingInt(CategoryEntity::getSort)).
                collect(Collectors.toList());


        return level1Menue;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO  检查当前删除的菜单，是否被引用

        // 逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> path = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, path);
        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);
    }
    private List<Long> findParentPath(Long catelogId,List<Long> path){
        //1.收集当前节点Id
        path.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),path);
        }
        return path;
    }

    // 递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        return all.stream().filter(categoryEntity -> categoryEntity.getParentCid() == root.getCatId()).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted(Comparator.comparingInt(CategoryEntity::getSort)).collect(Collectors.toList());
    }

}